Pneumatic Diaphragm Control Valve

Designed for accurate and responsive process regulation, the Pneumatic Diaphragm Control Valve combines a precision control valve body with a pneumatic diaphragm actuator to provide stable modulation of flow, pressure, temperature, and level. The actuator converts pneumatic control signals into controlled stem movement, enabling fast response and repeatable positioning across changing process conditions.

The Pneumatic Diaphragm Control Valve is widely used in chemical processing, petrochemical, oil & gas, power generation, water treatment, steam systems, and general process industries. With configurable trims, flow characteristics, and actuator actions, it can be adapted to applications ranging from general process control to demanding services involving high pressure drops, cavitation, flashing, or erosive media.

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Technical Specifications

Parameter	Specification
Valve Type	Globe Control Valve
Actuator	Spring Diaphragm Pneumatic Actuator
Operation	Air-to-Open / Air-to-Close
Size Range	DN20-DN600
Pressure Rating	PN10-PN420
Body Material	Carbon Steel / Stainless Steel / Alloy Steel
Medium	Gas, Steam, Water, Oil, Chemical Fluid
Temperature Range	-40℃~600℃
Flow Characteristic	Equal Percentage / Linear
Seat Leakage	ANSI Class IV-VI
Positioner	Smart Electro-Pneumatic Positioner
Standards	IEC 60534 / ANSI / API

Features & Benefits

Provides precise automatic control of flow, pressure, temperature, and liquid level for optimized process performance.

Pneumatic Diaphragm Actuation

Provides responsive and stable stem positioning for continuous process regulation.

Accurate Modulating Control

Enables precise adjustment of process flow to help maintain pressure, temperature, level, and flow setpoints.

Flexible Flow Characteristics

Linear, equal-percentage, and other trim characteristics can be selected to match different process dynamics.

Reliable Positioning

Pneumatic actuation provides repeatable movement and can be paired with a positioner for improved control accuracy.

Fail-Safe Configurations

Air-to-open, air-to-close, and other actuator arrangements can be selected according to process safety requirements.

Specialized Trim Options

Anti-cavitation, low-noise, hardened, and erosion-resistant trims can be configured for challenging services.

Adaptable to High Pressure Drops

Engineered trim designs can manage severe differential pressure while reducing excessive velocity, vibration, and noise.

Wide Instrumentation Compatibility

Positioners, solenoid valves, limit switches, air filters, regulators, and other accessories can be integrated into the control assembly.

Maintainable Construction

Trim and actuator components can be inspected and serviced according to the selected valve configuration.

Broad Process Application

Suitable for steam, gas, liquids, chemical fluids, pressure control, flow regulation, and other automated process duties in petrochemical, power, oil & gas, and chemical industries.

Application Scenario

Chemical Industry

Ball valves, butterfly valves, gate valves, globe valves, check valves, and control valves ensure safe fluid isolation, precise process control, and reliable operation in demanding chemical processing applications.

Oil Industry

Engineered for reliable isolation, flow regulation, and backflow prevention, our valve solutions support upstream, midstream, and downstream oil production and refining operations.

Natural Gas

Providing leak-tight sealing, dependable flow control, and safe pipeline operation for natural gas transmission, storage, LNG, and distribution systems.

Metallurgy

Built to withstand high temperatures, abrasive media, and harsh operating conditions in steelmaking, smelting, and metallurgical processing.

Power Generation

Ensuring reliable isolation, accurate flow control, and long-term performance in steam, boiler, turbine, and power plant systems.

Pharmaceutical

Delivering hygienic, precise, and contamination-free flow control for pharmaceutical manufacturing and clean process applications.

Steel Industry

Designed for high-temperature, high-pressure, and severe-service conditions in iron making, steelmaking, rolling mills, and auxiliary process systems.

New Energy

Supporting hydrogen, LNG, carbon capture, battery materials, and renewable energy projects with advanced valve solutions for safe and efficient process control.